Fichten, C.S., & Sunerton, B. (1983). «Popular horoscopes and the "barnum effect"». The Journal of Psychology114: 123-134. doi:10.1080/00223980.1983.9915405.
Munro, G.D., & Munro, J.E. (2000). «Using daily horoscopes to demonstrate expectancy confirmation.». Teaching of Psychology27 (2): 114-116. doi:10.1207/S15328023TOP2702_08.